BDS Power Systems and Standby Powering

Question 1

What is the typical AC voltage range used to power active components in an HFC outside plant?

Accepted Answer

60-90V AC

Answer

30-40V AC

Answer

110-120V AC

Answer

220-240V AC

Question 2

What is the primary function of a power inserter in an HFC network?

Accepted Answer

To couple AC power onto the coaxial cable without disrupting the RF signal path

Answer

To boost signal levels at node locations

Answer

To convert DC power to AC for customer equipment

Answer

To protect equipment from power surges

Question 3

What type of battery is most commonly used in cable plant standby power supplies?

Accepted Answer

Valve-regulated lead-acid (VRLA)

Answer

Lithium-ion

Answer

Nickel-cadmium

Answer

Alkaline

Question 4

In the cable industry, what is the correct term for a power supply that delivers AC voltage to the plant while also providing battery backup during utility outages?

Accepted Answer

Standby power supply (SPS)

Answer

Passive power unit

Answer

Uninterruptible power supply (UPS) module

Answer

Active voltage regulator

Question 5

What is the purpose of a transfer switch in a cable plant standby power supply?

Accepted Answer

To automatically switch between utility power and battery backup during an outage

Answer

To regulate the output voltage to a constant level

Answer

To balance loads across multiple battery strings

Answer

To convert AC power to DC for battery charging

Question 6

What does 'power passthrough' mean in the context of HFC cable plant powering?

Accepted Answer

Allowing AC power to travel through passive devices to reach active downstream equipment

Answer

Passing RF signals through a power supply without attenuation

Answer

Converting utility power to regulated DC for active components

Answer

Bypassing a failed power supply using an alternate feed

Question 7

Which of the following is a key indicator that a cable plant power supply has switched to standby (battery) mode?

Accepted Answer

An alarm or status indication along with battery voltage appearing on the output

Answer

Increased RF signal levels at downstream amplifiers

Answer

A drop in output frequency from 60 Hz to 50 Hz

Answer

Complete loss of power to all downstream active equipment